Transgender activist Sylvia Rivera's presence at the Stonewall Riots has long been taken for granted. Martin Duberman's "Stonewall" features Rivera as one of his book's six "protagonists"; and this encyclopedia mentions Rivera's participation in the Riots. But David Carter's recently-published "Stonewall" has no mention of Rivera. In his defense, Carter argues that none of his sources - written or oral - could place Rivera at the scene of the Riots. Is Carter correct? In most other ways, Carter's books is rightly considered to be the definite history of the Stonewall Riots._________________Jesse G. Monteagudo